Hi @bcollado,
As Amine mentioned, cross check whether your creation date field is datetime data type or string in your schema.
IF IT IS DATETIME, then don't use any expression in query and
Simply Select @created before (now in value field, you can able to see a calendar drop down) in it select December 20 2023.
So it will be like @created before 20/12/2023 00:00:00 (this will fetch all records created before 20th December 2023).

If your field is STRING, either change the creationdate field's data type as datetime in schema
Or,
In query, use expression to convert your string creationdate to datetime by using below expression,
DateOnly(ToDateTime(@creationDate)) before DateOnly('2023/12/20')
